Détails:Flight 91 departed Anchorage at 21:45 for an IFR cargo flight to Saint Mary's. The pilot was cleared for a runway 16 LOC/DME approach at 23:25. Ten minutes later the aircraft crashed and broke into three. The pilot seats were found 50feet in front of the cockpit section. The wreckage was found at 04:00 the following morning.

Probable Cause:

PROBABLE CAUSE: "The pilot's descent below the minimum descent altitude on the instrument approach. Factors were pilot fatigue resulting from the pilot's rest period being interrupted by scheduling discussions and the night weather conditions of low ceilings and whiteout."